Quite Involved in Discussions

FMEA is just one of the tools used in Risk Management, similar to Ghantt chart used in project planning; so, I'm not sure if asking how does FMEA interact with CMMI is an appropriate question.
Are you looking at how software risk management or certain risk methodologies interact with CMMI?

Starting to get Involved

I'm not sure how helpful I can be, but I will try. If your company is evaluated to CMMI, it means you have a documented system for your software (from understanding the requirements, to creating your work breakdown structure, to communicating to the shareholders, to training, planning, developing the SW, testing it, validating it, verifying it, etc.)

Quite Involved in Discussions

Hello there,
So, I think FMEA is calling for Project Risk Management (Maturity 3) and for Casual Analysis and Resolution (Maturity 5) in CMMI.
Software FMEA sounds a weird think to me, due to the probabilty that the software will fail is 100% for me.
There could be however some analysis in design phase to guide the selection of alternative approaches, mostly to prefer the kind of design that inherently eliminates those suspected potential problems.